Hi, I am currently building an incubator for my (hopefully) soon to come snake eggs.
For the thermostat I have purchased a velleman MK133 kit.
But the problem it that I can only set the relay to switch on at 5-30 degrees. But it switches of at 30 degrees.
I want the relay to switch on degrees(That could be adjusted with RV1 - done)
I want the relay to switch off at 28 degrees. (Can be adjusted with R7)
The problem is, I don't know to what value R7 should be changed. (I know it should be lowered)
My uncle said that anybody with good op amp knowledge could help me calculate the correct value for R7.
Scematic link - http://i1129.photobucket.com/albums/m505/cyberduke1/mk138.jpg
For the thermostat I have purchased a velleman MK133 kit.
But the problem it that I can only set the relay to switch on at 5-30 degrees. But it switches of at 30 degrees.
I want the relay to switch on degrees(That could be adjusted with RV1 - done)
I want the relay to switch off at 28 degrees. (Can be adjusted with R7)
The problem is, I don't know to what value R7 should be changed. (I know it should be lowered)
My uncle said that anybody with good op amp knowledge could help me calculate the correct value for R7.
Scematic link - http://i1129.photobucket.com/albums/m505/cyberduke1/mk138.jpg